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- W4249493346 abstract "A Bacillus subtilis wild type strain and a kinA (spoIIJ) isogenic mutant were compared as hosts for the expression of the Escherichia coli beta-galactosidase gene, lacZ, driven by the B. subtilis aprE promoter in a chromosomal system. The 2 x SG sporulation formula, with some modifications, was used as a basal medium. The specific activity values recorded by the mutant strain at the stationary phase were markedly higher than those achieved by the wild type host. Exposure of the cells to increasing levels of chloramphenicol resulted in significant amplifications of the lacZ region. Gene copy numbers of 19 and 11 were estimated in the amplified wild type and kinA strains, respectively, with high segregational stability records. The magnitude of beta-galactosidase over-expression was dependent on, and roughly proportional to antibiotic resistance levels. Among five examined by-products, a 2.3-times diluted concentration of neutralized cheese whey was successfully used as a sole medium component for over-expression of the recombinant beta-galactosidase gene in B. subtilis." @default.
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- W4249493346 date "2001-03-01" @default.
- W4249493346 modified "2023-09-25" @default.
- W4249493346 title "Amplification of theEscherichia coli lacZ gene inBacillus subtilis and its expression on a by-product growth medium" @default.
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- W4249493346 doi "https://doi.org/10.1002/1521-4028(200103)41:1<17::aid-jobm17>3.0.co;2-" @default.
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